首先定义body的user-select: none;来禁止用户选择文本，然后再需要用户可以选择的元素css增加user-select: all，完整代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@100&display=swap');
html, body {
margin: 0;
padding: 0;
width: 100vw;
height: 100vh;
font-family: 'Roboto', sans-serif;
}
body {
user-select: none;
display: grid;
place-content: center;
place-items: center;
}
h1 {
font-size: 48pt;
line-height: 40pt;
margin-bottom: 0;
}
p {
width: 75%;
font-size: 34pt;
text-align: center;
}
.select-all {
user-select: all;
}
</style>
</head>
<body>
<p>Here is a number which the user needs to copy'n'paste. It is only the number which is relevant, so using CSS you can make it easy to copy.</p>
<p>Here is the number <code class="select-all">123456</code>, all other text is not relevant to copy.</p>
</body>
</html>
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